Reviews—Fritsch’s Paleozoic Dipnoi. 528 
One of the plates especially gives the development of the Cornulites 
of the Hudson-River group in various stages of growth. 
In thirteen fine plates and sixteen pages of text several species of 
Orthoceras, Gomphoceras, Cyrtoceras, Gyroceras, Nautilus, and Goni- 
atites from the Paleozoic rocks of North America, are well treated as 
part of the Supplement to Vol. V. 
In the Preface Prof. Hall briefly gives the history of the volume 
before us, and of the material and plates still remaining on hand for 
want of funds necessary for the publication, and acknowledges the 
liberality of many friends and Institutions in having lent him 
specimens for study and comparison. 
In the Introduction a bibliographic history, a classified list, and a 
chronological or stratigraphical distribution of the Devonian Trilo- 
bites and other Crustacea of North America are concisely given. A 
synopsis of the genera, with synonyms and sketches of types, form a 
very useful part of the Introduction. Our readers will thus see that 
Geologists, both at home and abroad, will greatly profit by the 
labours of Prof. Hall and Mr. Clarke in the Albany Museum ;: and it 
is hoped that the State of New York will be able to make the 
requisite appropriations for the furtherance of Prof. Hall’s earnest 
desire to work out a complete exposition of the Fossils of the State, 
and to finish the revision of such as in his opinion require renewed 
criticism. 
IJ.—Dr. Anton Fritscu on Crevopus AND OTHER PAL#OZOIC 
Drenoan Fisuzs.! 
R. FRITSCH’S great work upon the Permian Vertebrata of 
Bohemia has now progressed as far as the fishes, and the new 
part just issued treats of the interesting Dipnoan genus Ctenodus. 
As in the previous parts, devoted to higher Vertebrates, the text is 
accompanied by numerous woodcuts, in addition to the beautifully 
executed plates; and every known fossil throwing light upon the 
subject is amply discussed, no less than ten of the fioures represent- 
ing specimens that are not Bohemian, and six being devoted to 
important features in the skeletal anatomy of the living Ceratodus. 
The Professor commences by emphasizing the intimate relation- 
ship existing between the genera Ctenodus and Ceratodus, and con- 
tinues the introductory remarks by some brief reference to Mega- 
pleuron, Conchopoma, and Phaneropleuron, which he also considers to 
be close allies. An examination of the type-specimen of Megapleuron 
has convinced Dr. Fritsch that its supposed rhombic scales are truly 
those of a Paleoniscid mingled with the skeletun—a conclusion 
which the writer of this notice has also been able to confirm; and 
doubts are expressed as to whether Kner may not have been misled 
by a similar accident, when he assigned rhombic scales to Concho- 
poma. The latter is a more uncertain case; the scales of Conchopoma 
are small, thin, and striated; and the suggestion that the teeth of 
1 Anton Fritsch, ‘Fauna der Gaskohle und der Kalksteine der Permformation 
Bohmens,” Band ii. Heft 3 (‘* Die Lurchfische, Dipnoi, nebst Bemerkungen tber 
silurische und devonische Lurchfische ”), pp- 6592, pls. 71—80. (Prag, 1888.) 
